The Madison piercing sits horizontal in the lower cervical part, between the two collarbones and the upper edge of the breastbone (jugulum).
By this surface piercing the risk of outgrowing is very high, because it´s exposed to a bigger strain. Especially during the healing phase you should take care to accordingly hygiene and waive on necklace and rubbing clothing.
The completely healing of the Madison piercing takes at least 3 months and can´t be ensured.
For jewellery absolutely a special surface barbell should be applied. Of course other piercing barbells or ball closure rings (BCR) are possible, too, but they aren´t recommend, because they are tend especially to outgrowing.